Connecting device for drawing-table tops and standards



March 10, 1925.

C. C. FRASER CONNECTING DEVICE FOR DRAWING TABLE TOPS AND STANDARDS Filed Jan. 18, 1924 In ventor:

Patented Mar. 10, 1925.

UNITED STATES" CHELSEA G. FRASER, OF GRAND RAPIDS, MICHIGAN.

GONNECTING DEVICE FOR DRAWING-TABLE TOPS AND STANDARDS.

Application filed January 18, 1924; Serial No. 687,099.

To all whom it mw concern.

Be it known that I, CHELSEA G. FRASER, a citizen of the United States, residing at Grand Rapids, in the county of Kent and the State of Michigan, have invented certain new and useful Improvements in Connecting Devices for Drawing-Table Tops and Standards, of which thefollowing is a specification.

This invention relates particularly to devices which are used in attaching tilting tops to the standards of drawing tables of the pedestal type, such as used in schools and colleges, studios, and shops. My objects are, first, to provide a construction whereby the work-table or top may be rigid- 1y locked at various desirable Working positions with even the immature strength of a child, and as easily released and moved to another position; second, to involve in this construction a means for revolving the top when the nature of the artists work demands, without the necessity of unfasten ing and refastening his paper, such means providing a friction element which will render the top or work-table efficient at any point of stoppage, but which also provides a means of automatically registering rightangular alignment of edge or end.

I attain these objects by the use of the novel construction described herein and il-' Similar numerals refer to similar parts throughout the various views.

Referring to the drawing, the disc-plate 1 is pivoted directly to the back of the drawing-board 2 by a screw 3 passing through its center or hub, also passing through the center of a tension-disc 4 of spring material, which is slightly cupped to act as a friction between the drawing board and the disc-plate, said tension-disc being fastened immovably to the drawing board by nails at points 4 As a means of maintaining the periphery of the discplate 1 in close proximity to the drawingboard, and in constant contact with the tension-discv 1, the retainer brackets 5 are screwed to the drawing-board so that their noses project inwardly over therirn of the disc-plate.

The disc-plate l centrally supports two tilting brackets 6 and 7, which are pivoted tothe standard by a bolt 8. The tiltingbracket 6 is provided with a notched disc segment 6 which rotates as the drawingboard is moved tiltingly, and the said notches 6 correspond with various desirable working angles for the drawing-board when said notches are engaged with the tilting-latch, shown in Figures 1, a, and 5, and which is attached to a central portion of the standard. The tilting-latch comprises a case 9, within which the latch proper 10 is pivoted by a pin 1 The nose 10 of the latch protrudes through an opening 9 of the case. Tension is given the latch 10 by an expansion spring 1 housed within the lug 9 of the case and engaging a socket of the latch. A handle 10 of the said latch provides a grip for releasing the nose when engaged. 7

It is obvious that this arrangement provides a tilting drawing-board entirely practical and desirable, one that is self-locking, and one which, furthermore, can be speedily operated by even a very young person.

While a drawing-board and drawing table standard equipped with the device thus far detailed will rotate freely and will not slip in ordinary use in whatsoever position it is left, it is desirable that some means other than sighting with the eye should be pro vided for giving one edge and one end of the drawing-board a horizontal alignment with the body of the artist (positions most used) when he desires such a placement. With this object in view, therefore, I have provided my invention with the revolvinglatch shown in Figures 1, 6, and 7, and formed notches 1 and 1 in the periphery of the disc-plate to receive the nose of said latch. The latch-bolt 12 has a tapered nose which fits similarly shaped notches l and 1 in the rim of the disc-plate 1, such notches being placed at right angles to one another. The latch-bolt 12 is oscillatingly confined by U-shaped brackets 13, and these brackets are screwed to the drawing-board, with plates 14 intervening. The plates 14 offset appearing opposite it, as the, drawingboard is revolved, thus giving one of two opposed right angular positions for the board. If the other position is desired, the operator only has to withdraw the latch-bolt by pulling back the knob of the bolt, then release the knob and'rotate the board to the next notch.

Having thus described my invention, what,

I claimas new is In a connecting device for ad uStable drawing-boards and drawing table standards, the combination of a disc-plate pivoted at its center to the drawing-board back, a tension-plate fixed to said drawing-board between it and said disc-plate, brackets fastened to said drawing-board and projecting over and around the rim of said disc-plate, a spring-actuated latch attached to said drawing-board and engaging notches in the periphery of said disc plate, said disc-plate supporting brackets capable of being pivoted to the standard of the drawing table, one ofsaid brackets bearing openings engaging a locking device attached to said standard.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHELSEA C. FRASER.

Vitnesses:

WILLIAM J. MILLER, FRED VAN HORN. 

